//高度测量类
export default class MeasureHeight {
    this.viewer:any;
    this.positions = [];
    this.vertexEntities = [];
    this.labelEntity = undefined;
    this.measureHeight = 0; //测量结果


  constructor(viewer) {
    this.viewer = viewer;
    this.initEvents();
    this.positions = [];
    this.vertexEntities = [];
    this.labelEntity = undefined;
    this.measureHeight = 0; //测量结果
  }

  //初始化事件
  initEvents() {
    this.handler = new Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
    this.MeasureStartEvent = new Cesium.Event(); //开始事件
    this.MeasureEndEvent = new Cesium.Event(); //结束事件
  }

  //激活
  activate() {
    this.deactivate();
    this.registerEvents(); //注册鼠标事件
    //设置鼠标状态
    this.viewer.enableCursorStyle = false;
    this.viewer._element.style.cursor = 'default';
    this.isMeasure = true;
    this.circleRadius = 0.1;
    this.measureHeight = 0;
    this.positions = [];
  }

  //禁用
  deactivate() {
    if (!this.isMeasure) return;
    this.unRegisterEvents();
    this.viewer._element.style.cursor = 'pointer';
    this.viewer.enableCursorStyle = true;
    this.isMeasure = false;
  }

  //清空绘制
  clear() {
    //清除线对象
    this.viewer.entities.remove(this.lineEntity);
    this.lineEntity = undefined;

    //清除文本
    this.viewer.entities.remove(this.labelEntity);
    this.labelEntity = undefined;

    //移除圆
    this.removeCircleEntity();

    //清除节点
    this.vertexEntities.forEach((item) => {
      this.viewer.entities.remove(item);
    });
    this.vertexEntities = [];
  }

  //创建线对象
  createLineEntity() {
    this.lineEntity = this.viewer.entities.add({
      polyline: {
        positions: new Cesium.CallbackProperty((e) => {
          return this.positions;
        }, false),
        width: 2,
        material: Cesium.Color.YELLOW,
        depthFailMaterial: new Cesium.PolylineDashMaterialProperty({
          color: Cesium.Color.RED,
        }),
      },
    });
  }

  //创建结果文本标签
  createLabel() {
    this.labelEntity = this.viewer.entities.add({
      position: new Cesium.CallbackProperty((e) => {
        return this.positions[this.positions.length - 1]; //返回最后一个点
      }, false),
      label: {
        text: '',
        scale: 0.5,
        font: 'normal 40px MicroSoft YaHei',
        distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 5000),
        scaleByDistance: new Cesium.NearFarScalar(500, 1, 1500, 0.4),
        verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
        style: Cesium.LabelStyle.FILL_AND_OUTLINE,
        pixelOffset: new Cesium.Cartesian2(0, -30),
        outlineWidth: 9,
        outlineColor: Cesium.Color.WHITE,
      },
    });
  }

  //创建线节点
  createVertex(index) {
    let vertexEntity = this.viewer.entities.add({
      position: new Cesium.CallbackProperty((e) => {
        return this.positions[index];
      }, false),
      type: 'MeasureHeightVertex',
      point: {
        color: Cesium.Color.FUCHSIA,
        pixelSize: 6,
        // disableDepthTestDistance: 2000,
      },
    });
    this.vertexEntities.push(vertexEntity);
  }

  //创建圆 这样方便看出水平面的高低
  createCircleEntitiy() {
    this.circleEntity = this.viewer.entities.add({
      position: new Cesium.CallbackProperty((e) => {
        return this.positions[this.positions.length - 1]; //返回最后一个点
      }, false),
      ellipse: {
        height: new Cesium.CallbackProperty((e) => {
          return positionHeight(this.positions[this.positions.length - 1]);
        }, false),
        semiMinorAxis: new Cesium.CallbackProperty((e) => {
          return this.circleRadius;
        }, false),
        semiMajorAxis: new Cesium.CallbackProperty((e) => {
          return this.circleRadius;
        }, false),
        material: Cesium.Color.YELLOW.withAlpha(0.5),
      },
    });
  }

  //删除圆
  removeCircleEntity() {
    this.viewer.entities.remove(this.circleEntity);
    this.circleEntity = undefined;
  }

  //注册鼠标事件
  registerEvents() {
    this.leftClickEvent();
    this.rightClickEvent();
    this.mouseMoveEvent();
  }

  //左键点击事件
  leftClickEvent() {
    //单击鼠标左键画点点击事件
    this.handler.setInputAction((e) => {
      this.viewer._element.style.cursor = 'default';
      let position = this.viewer.scene.pickPosition(e.position);
      if (!position) {
        const ellipsoid = this.viewer.scene.globe.ellipsoid;
        position = this.viewer.scene.camera.pickEllipsoid(
          e.position,
          ellipsoid,
        );
      }
      if (!position) return;

      if (this.positions.length == 0) {
        //首次点击
        this.positions.push(position);
        this.createVertex(0);
        this.createLineEntity();
        this.createCircleEntitiy();
        this.createLabel();
      } else {
        //第二次点击结束测量
        this.measureEnd();
      }
    }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
  }

  //鼠标移动事件
  mouseMoveEvent() {
    this.handler.setInputAction((e) => {
      if (!this.isMeasure) return;
      this.viewer._element.style.cursor = 'default';
      let position = this.viewer.scene.pickPosition(e.endPosition);
      if (!position) {
        position = this.viewer.scene.camera.pickEllipsoid(
          e.startPosition,
          this.viewer.scene.globe.ellipsoid,
        );
      }
      if (!position) return;
      this.handleMoveEvent(position);
    }, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
  }

  //处理鼠标移动
  handleMoveEvent(position) {
    if (this.positions.length < 1) return;
    let firstPoint = cartesian3Point3(this.positions[0]); //第一个点
    let movePoint = cartesian3Point3(position); //鼠标移动点
    const h = movePoint[2] - firstPoint[2];
    firstPoint[2] = movePoint[2];
    const twoPosition = Cesium.Cartesian3.fromDegrees(
      firstPoint[0],
      firstPoint[1],
      movePoint[2],
    );
    if (this.positions.length < 2) {
      this.positions.push(twoPosition);
      this.createVertex(1);
    } else {
      this.positions[1] = twoPosition;
      this.measureHeight = h.toFixed(3);
      this.labelEntity.label.text = '高度：' + this.measureHeight + ' 米';
    }
    //计算圆的半径
    this.circleRadius = getDistanceH(this.positions[0], position);
  }

  //右键事件
  rightClickEvent() {
    this.handler.setInputAction((e) => {
      if (this.isMeasure) {
        this.deactivate();
        this.clear();
      }
    }, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
  }

  //测量结束
  measureEnd() {
    this.deactivate();
    this.MeasureEndEvent.raiseEvent(this.measureHeight); //触发结束事件 传入结果
  }

  //解除鼠标事件
  unRegisterEvents() {
    this.handler.removeInputAction(Cesium.ScreenSpaceEventType.RIGHT_CLICK);
    this.handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
    this.handler.removeInputAction(Cesium.ScreenSpaceEventType.MOUSE_MOVE);
  }
}
